GNU bug report logs - #1611
23.0.60; smooth-scroll sluggish

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Package: emacs; Reported by: David <david.boon@HIDDEN>; merged with #3978, #4108; dated Wed, 17 Dec 2008 20:25:03 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Merged 1611 3978 4108. Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 1611@HIDDEN:


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From: David <david.boon@HIDDEN>
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Further testing without smooth-scrolling enabled suggests that it doesn't
matter if smooth-scrolling off or on:

I ran elp without smooth-scrolling on again, same file:
next-line      685         18.373000000  0.0268218978

Function Name  Call Count  Elapsed Time  Average Time
=============  ==========  ============  ============
next-line      726         17.129000000  0.0235936639
line-move      686         16.911000000  0.0246516034


And I re-profiled with the older emacs build, same .emacs startup files:

Function Name  Call Count  Elapsed Time  Average Time
=============  ==========  ============  ============
next-line      653         1.5950000000  0.0024425727
line-move      652         0.5180000000  0.0007944785

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Further testing without smooth-scrolling enabled suggests that it doesn&#39;t matter if smooth-scrolling off or on:<br><br>I ran elp without smooth-scrolling on again, same file:<br>next-line&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 685&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 18.373000000&nbsp; 0.0268218978<br>
<br><span style="font-family: courier new,monospace;">Function Name&nbsp; Call Count&nbsp; Elapsed Time&nbsp; Average Time</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
=============&nbsp; ==========&nbsp; ============&nbsp; ============</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">next-line&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 726&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 17.129000000&nbsp; 0.0235936639</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">line-move&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 686&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 16.911000000&nbsp; 0.0246516034</span><br style="font-family: courier new,monospace;">
<br><br>And I re-profiled with the older emacs build, same .emacs startup files:<br><br><span style="font-family: courier new,monospace;">Function Name&nbsp; Call Count&nbsp; Elapsed Time&nbsp; Average Time</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">=============&nbsp; ==========&nbsp; ============&nbsp; ============</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">next-line&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 653&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.5950000000&nbsp; 0.0024425727</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">line-move&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 652&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.5180000000&nbsp; 0.0007944785</span><br><br><br><br>

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Acknowledgement sent to David <david.boon@HIDDEN>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.
Information forwarded to bug-submit-list@HIDDEN, Emacs Bugs <bug-gnu-emacs@HIDDEN>:
bug#1611; Package emacs. Full text available.

Message received at submit@HIDDEN:


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Date: Wed, 17 Dec 2008 15:15:16 -0500
From: David <david.boon@HIDDEN>
To: emacs-pretest-bug@HIDDEN
Subject: 23.0.60; smooth-scroll sluggish
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For a while I've noticed that scrolling has been pretty slow, a couple of
months back it improved quite a bit.  But still, noticably slow.

I decided to elp-instrument some likely candidates:
In a recent version of emacs, built a few weeks ago from cvs trunk:
Function Name                           Call Count  Elapsed Time  Average
Time
======================================  ==========  ============
============
next-line                               944         42.020999999
0.0445137711
smooth-scroll-lines-from-window-bottom  943         18.337000000
0.0194453870


From a version built a long while back, GNU Emacs 23.0.50.1
(i386-mingw-nt5.1.2600) of 2007-10-23 on myhost:
Function Name                           Call Count  Elapsed Time  Average
Time
======================================  ==========  ============
============
next-line                               678         5.5799999999
0.0082300884
smooth-scroll-lines-from-window-bottom  660         0.7630000000
0.0011560606
count-screen-lines                      662         0.6690000000
0.0010105740

Both of those elp-results came from pressing C-n on the same file from top
to bottom.  The file has 671 lines in it.  It appears to me that the more
recent versions of emacs have very slow "next-line"

If I don't load 'smooth-scroll' scrolling speed is quite good.

Thanks

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
f:/devtools/emacs-23.0.60.1/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-09-21 on myhost
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -I../../include -pipe'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: JDE/l

Minor modes in effect:
  diff-auto-refine-mode: t
  semantic-decoration-mode: t
  jde-plugin-minor-mode: t
  jde-jdb-minor-mode: t
  shell-dirtrack-mode: t
  icicle-mode: t
  minibuffer-indicate-depth-mode: t
  nxhtml-global-minor-mode: t
  display-time-mode: t
  recentf-mode: t
  which-function-mode: t
  savehist-mode: t
  delete-selection-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  abbrev-mode: t

Recent input:
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n M-x e l p -
r e u l <tab> <backspace> s <backspace> <backspace>
s u l <tab> <return> <up> <up> <down-mouse-1> <mouse-movement>
<mouse-movement> <help-echo> <mouse-movement> <mouse-movement>
<mouse-movement> <mouse-movement> <mouse-movement>
<drag-mouse-1> <up> <up> <up> <help-echo> <down-mouse-1>
<mouse-movement> <mouse-movement> <drag-mouse-1> <down-mouse-1>
<mouse-1> C-SPC C-SPC <up> <up> <up> <up> <up> M-w
C-x b n o t <tab> <return> <C-end> <return> <return>
r <return> <return> C-y <up> <up> <up> <C-end> <return>
C-y C-x C-s <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> C-SPC C-SPC <down> <down> <down> <down> <down>
<down> <down> <down> M-w <down-mouse-1> <mouse-1> <return>
<return> M-x e m a c s - b u <tab> <S-tab> <return
>

Recent messages:
Mark set
notes changed on disk; really edit the buffer? (y, n, r or C-h)
Please type y, n or r; or ? for help
notes changed on disk; really edit the buffer? (y, n, r or C-h)

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<br>For a while I&#39;ve noticed that scrolling has been pretty slow, a couple of months back it improved quite a bit.&nbsp; But still, noticably slow.<br><br>I decided to elp-instrument some likely candidates:<br>In a recent version of emacs, built a few weeks ago from cvs trunk:<br>
<span style="font-family: courier new,monospace;">Function Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Call Count&nbsp; Elapsed Time&nbsp; Average Time</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">======================================&nbsp; ==========&nbsp; ============&nbsp; ============</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">next-line&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 944&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 42.020999999&nbsp; 0.0445137711</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">smooth-scroll-lines-from-window-bottom&nbsp; 943&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 18.337000000&nbsp; 0.0194453870</span><br style="font-family: courier new,monospace;">
<br style="font-family: courier new,monospace;"><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">From a version built a long while back, GNU Emacs 23.0.50.1 (i386-mingw-nt5.1.2600) of 2007-10-23 on myhost:</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">Function Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Call Count&nbsp; Elapsed Time&nbsp; Average Time</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">======================================&nbsp; ==========&nbsp; ============&nbsp; ============</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">next-line&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 678&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5.5799999999&nbsp; 0.0082300884</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">smooth-scroll-lines-from-window-bottom&nbsp; 660&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.7630000000&nbsp; 0.0011560606</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">count-screen-lines&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 662&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.6690000000&nbsp; 0.0010105740</span><br><br>Both of those elp-results came from pressing C-n on the same file from top to bottom.&nbsp; The file has 671 lines in it.&nbsp; It appears to me that the more recent versions of emacs have very slow &quot;next-line&quot;<br>
<br>If I don&#39;t load &#39;smooth-scroll&#39; scrolling speed is quite good.&nbsp; <br><br>Thanks<br><br>If Emacs crashed, and you have the Emacs process in the gdb debugger,<br>please include the output from the following gdb commands:<br>
&nbsp;&nbsp;&nbsp; `bt full&#39; and `xbacktrace&#39;.<br>If you would like to further debug the crash, please read the file<br>f:/devtools/emacs-23.0.60.1/etc/DEBUG for instructions.<br><br><br>In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)<br>
&nbsp;of 2008-09-21 on myhost<br>Windowing system distributor `Microsoft Corp.&#39;, version 5.1.2600<br>configured using `configure --with-gcc (3.4) --cflags -I../../include -pipe&#39;<br><br>Important settings:<br>&nbsp; value of $LC_ALL: nil<br>
&nbsp; value of $LC_COLLATE: nil<br>&nbsp; value of $LC_CTYPE: nil<br>&nbsp; value of $LC_MESSAGES: nil<br>&nbsp; value of $LC_MONETARY: nil<br>&nbsp; value of $LC_NUMERIC: nil<br>&nbsp; value of $LC_TIME: nil<br>&nbsp; value of $LANG: ENU<br>&nbsp; value of $XMODIFIERS: nil<br>
&nbsp; locale-coding-system: cp1252<br>&nbsp; default-enable-multibyte-characters: t<br><br>Major mode: JDE/l<br><br>Minor modes in effect:<br>&nbsp; diff-auto-refine-mode: t<br>&nbsp; semantic-decoration-mode: t<br>&nbsp; jde-plugin-minor-mode: t<br>
&nbsp; jde-jdb-minor-mode: t<br>&nbsp; shell-dirtrack-mode: t<br>&nbsp; icicle-mode: t<br>&nbsp; minibuffer-indicate-depth-mode: t<br>&nbsp; nxhtml-global-minor-mode: t<br>&nbsp; display-time-mode: t<br>&nbsp; recentf-mode: t<br>&nbsp; which-function-mode: t<br>
&nbsp; savehist-mode: t<br>&nbsp; delete-selection-mode: t<br>&nbsp; mouse-wheel-mode: t<br>&nbsp; file-name-shadow-mode: t<br>&nbsp; global-font-lock-mode: t<br>&nbsp; font-lock-mode: t<br>&nbsp; global-auto-composition-mode: t<br>&nbsp; auto-composition-mode: t<br>
&nbsp; auto-encryption-mode: t<br>&nbsp; auto-compression-mode: t<br>&nbsp; column-number-mode: t<br>&nbsp; line-number-mode: t<br>&nbsp; abbrev-mode: t<br><br>Recent input:<br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <br>
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n M-x e l p - <br>r e u l &lt;tab&gt; &lt;backspace&gt; s &lt;backspace&gt; &lt;backspace&gt; <br>s u l &lt;tab&gt; &lt;return&gt; &lt;up&gt; &lt;up&gt; &lt;down-mouse-1&gt; &lt;mouse-movement&gt; <br>
&lt;mouse-movement&gt; &lt;help-echo&gt; &lt;mouse-movement&gt; &lt;mouse-movement&gt; <br>&lt;mouse-movement&gt; &lt;mouse-movement&gt; &lt;mouse-movement&gt; <br>&lt;drag-mouse-1&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;help-echo&gt; &lt;down-mouse-1&gt; <br>
&lt;mouse-movement&gt; &lt;mouse-movement&gt; &lt;drag-mouse-1&gt; &lt;down-mouse-1&gt; <br>&lt;mouse-1&gt; C-SPC C-SPC &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; M-w <br>C-x b n o t &lt;tab&gt; &lt;return&gt; &lt;C-end&gt; &lt;return&gt; &lt;return&gt; <br>
r &lt;return&gt; &lt;return&gt; C-y &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;C-end&gt; &lt;return&gt; <br>C-y C-x C-s &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; &lt;up&gt; <br>&lt;up&gt; &lt;up&gt; C-SPC C-SPC &lt;down&gt; &lt;down&gt; &lt;down&gt; &lt;down&gt; &lt;down&gt; <br>
&lt;down&gt; &lt;down&gt; &lt;down&gt; M-w &lt;down-mouse-1&gt; &lt;mouse-1&gt; &lt;return&gt; <br>&lt;return&gt; M-x e m a c s - b u &lt;tab&gt; &lt;S-tab&gt; &lt;return<br>&gt;<br><br>Recent messages:<br>Mark set<br>notes changed on disk; really edit the buffer? (y, n, r or C-h) <br>
Please type y, n or r; or ? for help<br>notes changed on disk; really edit the buffer? (y, n, r or C-h) <br><br>

------=_Part_13676_29747938.1229544916288--




Acknowledgement sent to David <david.boon@HIDDEN>:
New bug report received and forwarded. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.
Report forwarded to bug-submit-list@HIDDEN, Emacs Bugs <bug-gnu-emacs@HIDDEN>:
bug#1611; Package emacs. Full text available.
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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.